Physics, 08.04.2021 14:00, ptrlvn01

A car driver spends 3hrs driving at an average speed of 80km/hr, stops for 30 minutes to have some rest, and then drives at an average speed of 90km/hr for 2 hours.
Calculate the average speed during the whole journey

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A car driver spends 3hrs driving at an average speed of 80km/hr, stops for 30 minutes to have some...